Black azodyestuffs and process of making same



Patented Mar. I4, 1933 UNITED STATES" RICHARD FLEISCHIHAUER AND GARLTHEO PATENT: ori ce" soHULTI s, or FRANKFORTLON-THE-MAINJ rncnnnnnm, GERMANY, ASSIGNORS T0 GENERAL ANILINE woaxs, 1110., or nnw' YORK,1\T.Y.,A coRPonArIononnEL-Awmnu w e. v v

BLACK AzonYEsrUrrs m rnocass or "MA ING SAME a No Drawing. Application filed October a, 1930, Serial n6. ase o sa m in Germany as $1929., a

' Our present invention relates to new dyestufis which yield black dyeings .of .an 7 excellent fastness to light and washinglwhen after-treated with an aldehyde and with a copper'salt, and it relates furthermore to a process of making such dyestuffs" I 4 The process of manufacturein accordance with this invention comprises combining a l 1 amino 8-- hydroxy-naphthalene sulfonic acid of the general formula:

? gen or a sulfonic acid group 7 with the diazocompound of two amines of the formulae: H2N QR +HzNQR hydronyl or carboxylic acid: group, the other 7 R an alkoxy, hydroxyl'or carboxyl c' 391d" grbupythe two R meansnlt'roor acylamlno groups and the benien nuclei may contain further 7 substituents,; transforming in thediazo-dyestuifs thus produced the groups R into amino groups inthe known manner,'tet-' o razotizing and combining these tetraz o"com-.

' OH R Z t A pounds with two compounds of the formula o z wherein each Z means an amino or hy-droxy groups and the benzene nucleus may contain 7 further substituents. a r

The dyestuffs thus obtained correspond probably to the general formula V V V y the presentinvention no injury of such a' wherein one B means'hydrogeman alkony wherein X; Y, Z, R and the benzene nuclei have the aforesaid signification. V

The above mentioned after-treatment is advantageously carried out on the fiber, For this purpose thedyed'goods are "treated, si multaneously or in any sequence, with an aldehyde, especially formaldehyde, andwith a copper salt. .7 V

- It is a remarkable fact that the formation of a copper complexjtake's place in conjunction with theaction ofthe aldehyde andfurthermore that thefastness to washing is not:

injured by this combinedtreatment. v

Itis well known in theart that the fastness to washing is improved by treating certain direct black cotton dyestuffsv on the fiber with formaldehyde. However the dyein'gs thus obtained exhibit relatively little fastness tolight. This disadvantage, which could hith-' erto not be avoided even by any further treat- :nent, prevented a larger employment ofthe after-treatment with formaldehyde.- By the combined after-treatment of the dyestufis of nature has'been observed.

in 'centigrade degreesg 'lWe wish it however to be understood that ,weiare not limited to;

tions mentioned therein;

E w ample 1 amino 8 hydroxynaphthalene-i'fisdisulfonic acid. The -mass is rendered alkaline by means of an excess of sodium carbonate and the monoaz'o-idyestufl' is again combined with is i invenparts being .by weight and alltemperatures V the particular productsnor; reaction, condi-f v 16.8 parts of 5-nitro 2amino-l-anisole are.- diazotized in the customary. manner. The diazo solution thus obtained is combined in;

" an alkaline mediumwith 31.9 parts of la diazo solution prepared from 1.6.8 parts of 7 5-nitro-2-amino-1-anis0le. tion of the disazo dyestuff is finished it is filtered and again made-to apasteby means of water. i, Thereto an aqueous solution of 7 2 parts of crystallized sodiuniisulfide isadded and the mass is stirred at a moderate temperature until the reduction is finishedi" After the forma Then the reduced dyestufi' is precipitated by the addition of common salt, filtered and washed. The paste thus produced which dissolves in water to a bluish green solution is again suspended in water and mixed with an aqueous solution of 14 parts of sodium nitrite and with the necessary amount of hydrochloric acid. \Vhen the tetrazotation is finished, the mass is allowed to run into a solution containing 22 parts of 3-amino-1- hydroxybenzene and an excess of sodium carbonate. After the end of the combining reaction the precipitated dyestuif is filtered and dried. It represents a black bronzy powder soluble in "water and dyeing the Vegetable fiber reddish black shades. It corresponds probably to the formula i The dyeing may be after-treated in the following manner: The goods dyed in the usual way are rinsed, treated for 30 minutes in a hot or boiling bath containing about 363% of a solution of formaldehyde of strength and about 0,5% of copper sulfate (calculated to the dyegood) rinsed and dried. The dyeings after-treated in this manner have become somewhat more greenish and are distinguished by an excellent fastness to washing, boiling with acidand to light.

. The after-treatment may also be carried out subsequently in two operations. 49 I Ewampl The tetrazocompound of the amino-disazodyestufl' prepared according to Example;

It represents when dry a black powder soluble in water, dyeing the vegetable fiber red dish black shades. These dyeings become somewhat more greenish and very fast to washing, boiling with acid and to light when after-treated with acetaldehyde and copper acetate in the manner described in Example 1. V g

- Ewample 3 Then in Example 1 double the equivalent amount of 5-nitro-4-methyl-2-amino-1-anisole is used as diaZo-compound instead of 5- nitro2-a-mino l;anisole, an analogous greenish blue disazodyestulf is obtained by combination with 1-amino-8-hydroxy-naphthalene- 4.6-disulfonic acid and by following reduc-. tion. The tetrazo'compound of this d-isazodyestufl' is allowed to run into an aqueous solution containing 22 parts, of resorcinol andan excess of sodium carbonate. The new dyestufi' isolated in the customary manner represents. a black powder soluble in water andv 4 dyeing'cotton black shades. corresponds to the formula: l

N=N 1N=N -01:

00113 ((11 Boss H2 OH c oH3 on t L SOaH 4N=N N=N oH I a on E'zvample '4 13.8 parts of l-nitro aniline are diazotized in the usual manner and the diazo compound is combined in an .acid medium with 31.9

parts of laminjo 8-hydroxy-naphthalene-4.6- disulfonic acid. The monoazo dyestufi is means of sodium carbonate with the diazo' :compound of 13.8 parts of 5-nitro-2-amlnosl anisole. The disazo dyestuff is isolated and then; reduced with a solution of 72 parts of crystallized sodium sulfide. The reduced dyestufi' is tetrazotized in an aqueous suspension with a solution of 14 parts of sodium nitrite and with an excess of hydrochloric acid and then combined with a solution con-f taining 22 parts of meta-phenylene-dlamlne and an excess of sodlum carbonate. The new dyestufif thus obtained is isolated by the addiably to the formula:

NHz

amino-l-phenol, 5-nitro-4-chloro-2-amino-1-.

anisole,.and onthe other hand for instance 2-chloro- 4e-nitro-aniline, 2.6-dichloro-t-nitro-. aniline, 2-methyl-4c-nitro-aniline or sulfonic acids of these compounds.

Ewample 5 13.8-parts of t-nitro-aniline are di'azotized in the usual manner and combined in an acidic medium-with 31.9 parts of 1-amino-8- hydroxy naphthalene 3.6 -disulfonic' acid.

Into the solution of this m'onoazo dyestulf rendered alkaline with sodium carbonate a diazo solution of19/1-pa-rts of'2-acetylan1ino- -methyl-ta-amino 1-anisole is introduced. The disazo dyestuff is filtered off, saponified by heating it with a 10% caustic soda solution and thenreducedwith an, aqueous solution of 36 parts of crystallized sodium sulfide. The amino disazo dyestuff which dissolves and copper salts;

in water with a greenish blue'tint is tetrazotized in the manner described in Example 1. combined in a solution rendered alkaline by Thefsuspension of the tetrazo compound is allowed to run into a solution containing an mula;

, NHZ um I -on ooH3 NHa I H038 N.=N .N=N on Q CH3 I It represents, when dry a black powder soluble in water, dyeing the vegetable'fiber full black shades becoming fast to washing'and light when after-treated with formaldehyde The same dyestuflimay also be producedby 7 using instead of t-nitroaniline the equivalent amount of 4:-acetylamino-l-amino-benzene and by omitting the treatment .with sodium sulfid.

Similar dyestuffs are obtained when 2 acetylamino-t-methyl-5-amino 1- anisole is replaced by the equivalent amount of l-acetylamino-t-amino-2'.5-dimethoxy 1.1 azobenzene or of t-acetylamino-2.5-di1nethoxyl-faminobenzene. I

Example6 a The dia'zo' compound of'18' parts of '2 acetylamino 5-amino-1 anisole is combined in a feeblyacid medium with 81.9 parts of l-amino ,8; hydroxy naphthalene- 4.6 disulfonic acid and the mon'oazodyestufl? is com-f blned 1n the presence of an excess of sodium.

carbonate with'the diazo compound of 15 1 parts of 4- acetylarnino-l aminobenzene. The -blue 'disazo dyestufi' is, isolated, saponified with a "10% caustic soda lye, again isolated and then. tetrazotiz'ed. The free mineral acid isneutralized by the addition of a sodium mine has disappeared an aqueous solution of about 11 parts of resorci'nol andan amount of sodium carbonate sufiicient'for keeping the mass alkaline are added. 1

to the probable formula;

The dyestuff thus-produced corresponds 1 It represents when dry a black powder, solj uble in water, dyeing the vegetable fiber full black shades which become somewhat more bluish and fast to Washing and light when after-treatedwith formaldehyde and cop--:

per salts.

E wamp-Ze '7 WVhen in Example 6 -acetylamino-L'a'minobenzene is replaced by the equivalent amount of Q-acetylamino--chloro--aminol-methoxy-benzene, a dyestufi is obtained which corresponds to the probable formula:

It yields when after-treated on the fiber with formaldehyde and copper salts bluish black shades, notably fast to washing and light.

. p 7 Ear/ample 8 The diazo solution of 18 parts of 2-acety1- amino-5-amino-1-anisole is combined in an acidic medium with 23.9 parts of l-arnino-S- hydroxy-naphthalene4-sulfonic acid and the monoazodyestuff is again combined in the presence of sodium carbonate with the same diazo compound. The isolated disazo dyestuff is sap'onified by means of a caustic soda; v ;lye of about strength and then tetrazo-' tized as described above. The suspension of the tetrazo compound is combined in the presence of sodium carbonate with 22 parts ofresorcinol. The dyestuff thus produced corresponds probably to the formula:

OH 00H? It represents a black,- water-soluble powder dyeing cotton full black shades fast to washing and light when after-treated with formaldehyde and copper salts. v Example 9 A neutralaqueous solution of 31.6 partsof l -amino 8 rhydroxynaphthalene-fi-disulfonic acid introduced into an acid diazo solu-- tion prepared from 13.8 parts of 4-nitro-aniline. monoazo dyestufi is mixed with an excess of i sodium carbonate and then combined with the diazo compound of-15.4 parts of 5-nitr0- 2-amino-l-hydroxy-benzene. The aqueous paste of the isolated disazo dyestufl is re-' duced at while stirring with an aqueous solution of 72 parts of crystallized sodium sulfide. The isolated reduction product is tetrazotized at 0 and the tetrazo compound is combined with 21.6-parts of 1.8 diaminobenzene in the presence of sodium carbonate.

The dyestuif thus produced corresponds to the formula: Y

It represents when dry a black powder dyeing cotton black shades fast to light and washing when after-treated with formaldehyde and copper salts.

Example 10 When in Example 9, 15.4 parts of 5-nitro- I 2-a1nino-1-hydroxy-benzene are replaced by 18.2 parts of 5-a1nino-2-nitro-benzene-Lcarboxylic acid and the process is otherwise carried on in a like manner, a dyestuif of similar properties is obtained which corresponds probably to the formula:

I Its dyeings on cotton become likewise fast to washing and light when after-treated with an aldehyde and copper salts.

We claim:

' 1. A process which comprises combining a When the-combination is'finished the a 1-amino 8-hydroxy-naphthalene sulfonic 'acid of the general formula:

X- NH:

wherein one X means hydrogen, the other X a sulfonic acid group and Y means hydrogen or a sulfonic acid group, with the .diazo compounds of two amines of the formulae:

wherein one R means hydrogen, an alkoxy, hydroxyl or carboxylic acid group, the other R an alkoxy, hydroxyl or carboxylic acid group, and the benzene nuclei may contain a halogen, alkoxy, alkyl or sulfonic acid group, transforming in the disazo dyestuffs thus produced the acylamino groups into amino groups by saponification, tetrazotlzing and combining these tetrazo compounds with two compounds of the formula wherein each Z means an amino or hydroxy group.

2. A process which comprises combinmg 1- amino-8-hydroxy-naphthalene 4:.6-disulfonic acid 'of the formula:

21 amino -8- hydroxy-naphtlialene 4.6- disulfonic acid of the formula:

iEIOnS .in an acidic medium with one molecular proportion of diazotized 2-acetylamino-5-aminol -anisole and in an'alkaline medium with one molecular proportion of diazotized 4- in an acidic medium with one molecular proportion ofdiazotized 2-acetylamino-5-aminol-anisole and in an alkaline medium with one molecular proportion of diazotized 2-acetylamino-et chloro-5-amino-l-anisole, saponifying in the disa'zo dyestuff thus produced the 'acetyla'mino groups into amino groups, tetrazotizing and combining this tetrazo compound with onemolecular" proportion of Hols NH:

SOaH

with the diazo compounds of two amines of the formulae:

ONE-acyl-l-HzNG-NH-acyl OCH:

wherein the benzene nuclei may be further 7 whereinone X means hydrogen, the other X a sulfonic acid group, Y hydrogen or a sul-, fonic. acid group, one R'hydrogen, an alkoxy,

substituted by chlorine methoxy or methyl, transforming in the disazo dyestuffs thus produced the acylamino groups into amino groups by saponification, tetrazotizing and,

combining these tetrazo compounds with two compounds of the formula:

wherein each Z means an amino or hydroxy group. Y

3. A process which comprises combining meta-phenylene diamine and 'one molecular proportion of resorcinol.

5. The azo dyestuffs of the probable eral formula: Y

0H z V hydroxylor carboxylic acid group, the other R an alkoxy, hydroXyl' or carboxylic acid group, each Z an'amino or hydroxy group and wherein the benzene nucelimay contain a halogen, alkoxy, alkyl or sulfonic acid group, which compounds represent when dry black powders soluble in water dyeing vegetable fibers black shades which become fast to washing and light when after-treatedwith' formaldehyde and copper salts.

'6. The azo dyestufi'sof the probable forwherein one means hydrogen, the otherR V.

a methoxy group, each Z an amino or hydroxy group and wherein the benzene nucell containing R may be further substituted by chlorine, methoxyor methyl, which compounds represent whendry' black powders soluble in water dyeing vegetable fibers black shades which become fast to washir'ig and light when after-treated with formaldehyde and copper salts. a i 7.'Tl1 e azo dyestufi of the probable formula: r

1103s NH: 0cm

' which compound represents when dryablack powder, soluble in water, dyeing the vegetable fiber full black shades which become somewhat more bluishand fast to'washing and light when after-treated with formaldehyde and copper salts.

9. The 21-20 d'yestuif mulaz H oas Niagara-{Glam OH for: I 1 i table 'fiber full black shades which become somewhat more bluish and 'fast'to washing and light when after-treated with formaldehyde and copper salts.

10. The dyestufl intermediates of the probable formula:

(wherein-one X means hydrogen, the other X a sulfonic acid group, Y hydrogen or a sulfonic acid group, one R hydrogen, an alkoxy, hydroxyl or carboxylic acid group,the

other R- an alkoxy, hydroxyl or carboxylic acid group and the benzene nuclei may contain a halogen, alkoxy, alkyl or sulfonic acid group) which eompoundsyield when tetra zotized and combined with amino-hydroxy or-diamino compounds of the benzene series valuable dyestuffs dyeing cotton black shades which become somewhat more. greenish and fast to washing and light when after-treated with formaldehyde'and copper salts.

In testimony whereof, we airlx our signatures.

RICHARD FLEISCHHAUER. OARLTHEO SCHULTIS.

er the probable ai which compound represents when dry a black n powder, soluble in water, dyeing the vege- 

